board: add Raytac MDBT50Q-RX Dongle with TinyUF2

src/machine/board_mdbt50qrx.go

@@ -0,0 +1,40 @@
+// +build mdbt50qrx
+
+package machine
+
+const HasLowFrequencyCrystal = false
+
+// GPIO Pins
+const (
+	D0 = P1_13 // LED1
+	D1 = P1_11 // LED2 (not populated by default)
+	D2 = P0_15 // Button
+)
+
+const (
+	LED = D0
+)
+
+// MDBT50Q-RX dongle does not have pins broken out for the peripherals below,
+// however the machine_nrf*.go implementations of I2C/SPI/etc expect the pin
+// constants to be defined, so we are defining them all as 0
+const (
+	UART_TX_PIN  = 0
+	UART_RX_PIN  = 0
+	SDA_PIN      = 0
+	SCL_PIN      = 0
+	SPI0_SCK_PIN = 0
+	SPI0_SDO_PIN = 0
+	SPI0_SDI_PIN = 0
+)
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "Raytac MDBT50Q - RX"
+	usb_STRING_MANUFACTURER = "Raytac Corporation"
+)
+
+var (
+	usb_VID uint16 = 0x239A
+	usb_PID uint16 = 0x810B
+)